Should it not be 'avant qu'on ne parte'?
Freeform Writing Exercise C1
You are correct that "ne" explétif can be included in this expression. This option is already part of the correct answers. However, in the lesson on "Avant que + ne explétif + the subjunctive mood", we also mention that the "ne" explétif can be dropped in speech - which is the case here.
I hope this is helpful.
Bonne journée !
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